linux-kernel - [PATCH v2 1/2] Bluetooth: btnxpuart: Remove check for CTS low after FW download

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Date:   Fri, 11 Aug 2023 15:42:31 +0530
From:   Neeraj Sanjay Kale <neeraj.sanjaykale@....com>
To:     marcel@...tmann.org, johan.hedberg@...il.com, luiz.dentz@...il.com,
        amitkumar.karwar@....com, rohit.fule@....com, sherry.sun@....com
Cc:     neeraj.sanjaykale@....com, linux-bluetooth@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] Bluetooth: btnxpuart: Remove check for CTS low after FW download

This removes the unnecessary check for CTS low after FW download.

After FW download is complete, the CTS line is already seen low.
It becomes high after 2 msec, and low again after FW initialization
is complete.
This makes the current check for CTS low redundant.

This removes the wait for CTS low section and increase delay to
1200msec instead, which is sufficiant for all NXP chipsets to
initialize FW.

Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@....com>
---
v2: Remove wait_for_cts low check in a separate commit (Francesco
Dolcini)
---
 drivers/bluetooth/btnxpuart.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/bluetooth/btnxpuart.c b/drivers/bluetooth/btnxpuart.c
index ee6f6c872a34..1dd60c7e6fe0 100644
--- a/drivers/bluetooth/btnxpuart.c
+++ b/drivers/bluetooth/btnxpuart.c
@@ -558,16 +558,11 @@ static int nxp_download_firmware(struct hci_dev *hdev)
 	}
 
 	serdev_device_set_flow_control(nxpdev->serdev, true);
-	err = serdev_device_wait_for_cts(nxpdev->serdev, 1, 60000);
-	if (err < 0) {
-		bt_dev_err(hdev, "CTS is still high. FW Download failed.");
-		return err;
-	}
 	release_firmware(nxpdev->fw);
 	memset(nxpdev->fw_name, 0, sizeof(nxpdev->fw_name));
 
 	/* Allow the downloaded FW to initialize */
-	usleep_range(800 * USEC_PER_MSEC, 1 * USEC_PER_SEC);
+	msleep(1200);
 
 	return 0;
 }
-- 
2.34.1